Decreased pollen sensitization in school-age children after the COVID-19 pandemic : COCOA study

Coronavirus disease 2019 (COVID-19) pandemic has changed lifestyles dramatically. The impact of COVID-19 on inhalant sensitization remains unknown. The purpose of this study is to investigate whether the COVID-19 outbreak affects the changes of inhalant sensitization and allergic disease at age 7 according to a birth year in a general population-based birth cohort.